属性动画

透明动画

ObjectAnimator animator = ObjectAnimator.ofFloat(v,"alpha",1f,0f);
                animator.setDuration(2000);
                animator.start();
        animator.addListener(new Animator.AnimatorListener() {
            @Override
            public void onAnimationStart(Animator animation) {

            }

            @Override
            public void onAnimationEnd(Animator animation) {
                finish();
            }

            @Override
            public void onAnimationCancel(Animator animation) {

            }

            @Override
            public void onAnimationRepeat(Animator animation) {

            }
        });